Opinion by
On the trial of the case the defendant introduced evidence of the height and weight of his adversary for the purpose of showing disparity of physical strength. This was admittedly competent and was material under the facts disclosed. This evidence showed, among other things, that Ryan was about five -feet nine inches high. In reply to the evidence for the defendant on this point, the commonwealth introduced a paper purporting to be a certificate of discharge of Ryan from the United States Army which contained a descriptive list stating the age, height, complexion, color of hair and occupation of ' *130the soldier. His height was given as five feet five and three fourths inches. We do not deem it necessary to determine the question whether the discharge offered in evidence is self-authenticating and prima facie admissible as evidence for any purpose. We do not consider it competent for the purpose for which it was admitted. The paper is not a record nor does it appear to be a copy of a record. It is a document delivered to a discharged soldier, presumably to place in his possession evidence of his service and lawful discharge. It is for his use and protection only. The personal description therein contained is given for identification and is purely incidental to the object of the paper which relates to service and discharge. The certificate as to height is no more important than that of complexion or color of hair or occupation. It is not shown that any statute, or regulation of the war department, requires this recital. The conclusiveness of such a document is restricted to the subject for which it was given.
It was held in Mutual Benefit Life Insurance Company v. Tisdale, 91 U. S. 238, citing Campbell v. Gordon, 10 U. S. 176, and Stark v. Chesapeake Insurance Co., 11 U. S. 420, that a certificate of naturalization is against all the world, a judgment of citizenship upon which may follow the right to vote and hold property and as such is conclusive, but that it is not admissible in another proceeding as evidence of the age or good character of the applicant. In Erickson v. Smith, 2 Abb. Ct. of App. (N. Y.) 64, the court held that a steamboat inspector’s certificate made under the act of congress of 1852 is evidence of the fact of the inspection by the officer appointed for that purpose, but that when challenged by a stranger it is not evidence of the facts recited therein notwithstanding that the officers are required by law to make a return of such facts.
In Hegler v. Faulkner, 153 U. S. 109 (14 Sup. Ct. Rep. 779), a question arose as to the age of an Indian who had been enrolled as one of a number entitled to participate in the division of lands under a treaty. One of the instructions of the Indian Department required the preparation of a roll containing the names of all applicants arranged by tribes and families and single persons, showing name, age, sex, relationship to the tribe and place of residence. A census had also been taken of Indians entitled to lands containing the name, age, etc., of certain Indians of *131whom the person in question was one. The records of the department were offered in evidence for the purpose of showing the age of the particular Indian in an issue involving the validity of a conveyance by him of land allotted. They were held to be in admissible for such purpose. The ascertainment of the ages of the parties entitled to an allotment was held to be merely for the purpose of enabling the agent to identify the individuals and when the allotment was completed the purposes of the inquiry were fulfilled and the records could not be resorted to in disputes between other parties to prove the age of Indians.
To the same effect is Clark v. Trinity Church, 5 W. & S. 266, and Sitler v. Gehr, 105 Pa. 577. As to strangers the incidental recitals in the discharge are purely hearsay and inadmissible as evidence.
It is contended, however, that the introduction of this evidence did not injure the defendant. That it was considered relevant by the commonwealth at the trial is evident. Testimony introduced by the defendant tended to show that Ryan was a man of much greater strength than the accused. This, if believed, might have an influence with the jury in at least creating a reasonable doubt as to the guilt of the defendant. It was important, therefore, for the commonwealth to produce rebutting evidence and it is manifest that a document purporting to be issued under the authority of the War Department giving an exact measurement of the height of Ryan would have great weight with the jury upon that point. It is not a logical answer to the objection to say that the defendant had introduced testimony upon this point and that lie had the full benefit of it. He was entitled to all the weight of his own competent evidence without any diminution or impairment by inadmissible evidence in rebuttal. It is impossible to determine to what extent this' evidence may have influenced the jury. And, as was said in Zell v. Commonwealth, 94 Pa. 258, “because of that uncertainty it should not have been admitted.”
The first assignment of error is therefore sustained.
The defendant was a policeman of the borough of Renovo and engaged in the discharge of his duty as such on one of the public streets of the borough. His defense was that he fired the fatal shot in self-defense while subjected to a violent assault *132by Ryan. The learned judge instructed the jury that the defendant mistook his official authority when saying to Ryan and his companion that it was part of his business as an officer to see that they were not around at that hour of the night (12:15 A. M.) sitting on other people’s steps ; that they had a right to refuse to go home, that what was said by Ryan when Crowley attempted to arrest him would not justify the latter in arresting Ryan and he had a right to resist; what Ryan said to Crowley was not a violation of the borough ordinance such as would justify an arrest; that the defendant was not justifiable in attempting to arrest Ryan under the circumstances and that therefore he had no right, as an officer, to stand and defend himself; that the rights of the defendant must be determined by the “ general rule of self-defense,” and that if he could have fled from his assailant it was his duty to do so.
It is contended on behalf of the defendant that irrespective of the propriety of his action in asking or directing the young men to go home there was evidence tending to show repeated assaults upon him by Ryan accompanied by violent and threatening language, and that the jury should have been permitted to determine whether there was an attempt to arrest Ryan and if so, whether the assault by the latter exceeded the reasonable resistance necessary to prevent such attempted arrest. The only witnesses called by the commonwealth who were present when the shot was fired were Frank McCarthy, the companion of Ryan and Edwin Bower, the latter about eighty-five feet away. Upon the subject of arrest, McCarthy testified:
“He (Crowley) says, ‘Well, you had better go home to bed.’ He said something about arresting us and locking us up. Could not just say it was that. It was something like that.”
Ryam then got up, after which he and the defendant had some words. The witness could not hear what Crowley said because his voice was weak, but he heard Ryan calling him an offensive name. The attention of the witness was called to Mr. Bower, who had just passed, after which he states :
“ I looked over then and he (Crowley) had his back to me and his arms behind him, and it looked to me as here was Crowley standing and Bill (Ryan) had his back against this building here, and it looks to me as if he had his arms down *133alongside. I guess his arms were not on Crowley anywheres as near as I could see. Crowley, was standing right in front of him about three feet, and it seems Will kind of run out, I don’t know, started to walk toward him and that he could not run out and Crowley had his hands behind his back. . . . Had his revolver drawn in his right hand and his hands folded behind his back. Well, now it seemed he stood there awhile with his hands behind his back. I could not say; I could see both arms drop, didn’t raise his left arm ; could not see, but his right arm went up and the shot was fired. Then I ran over.”
Bower testified that:
“ The night policeman was apparently attempting to arrest one of the young men.”
At another stage of the examination he said : “ I was under the impression, as I say, that he was attempting to make an arrest; ” and again : “ The night policeman was evidently attempting to make an arrest and had hold of one of the young men whom I did not know at the time, and who afterwards developed to be Ryan.”
The witness then described the manner in which Ryan twice pushed the defendant down on the sidewalk. After Crowley got up the witness saw him proceed directly westward from the point jrhere he was standing and Ryan also went in the same direction. They passed into the shadow of a building which obscured them from the witness. There was comparative quiet for a brief space, then the altercation began again. The only voice which the witness could distinguish was Ryan’s, who was using profane and threatening language to the policeman. The language was of such a character as to threaten him with bodily hftrm. After this the witness heard the report of the shot.
The defendant testified that he said to McCarthy and Ryan, “ Boys, it is after twelve o’clock and time for you to be in bed; ” that Ryan jump up using offensive language, whereupon the ‘defendant said, “ If you don’t quit this boisterous talk I will have to arrest you,” to which Ryan replied in vulgar language that he (the defendant) could not arrest anybody; “that time he got hold of me and I started away towards the depot to get assistance to arrest him, and when I *134turned to walk away from him he struck me right here in the neck and pushed me down on the pavement on my hands.” The witness then described the manner in which he was twice knocked down afterwards, and that after he was knocked down the third time Ryan stood over him saying he was going to kill him if it was the last act of his life, and that then the defendant fired the shot. On cross-examination he stated that he was trying to arrest Ryan after he called him the names referred to.
If we assume that the defendant exceeded his authority in advising or directing McCarthy and Ryan to go home under the circumstances, it does not so clearly appear from the evidence that Ryan was engaged in resisting an unlawful arrest as to justify the conclusion that the officer was bound to fly if he were able so to do. If the defendant’s evidence is credited, just before the assault upon him he turned from Ryan and started to procure assistance and there was apparently no necessity for the violence on the part of Ryan alleged by the defendant. The parties had passed out of the view of Bower so that he did not know what their attitude was immediately before the shot was fired. The testimony of McCarthy gives little information on the subject of the attempted arrest. The defendant claimed that he was thrice knocked down on the pavement and that after the third blow Ryan stood over him in an angry manner and threatened to kill him. It became necessary, therefore, for the jury to consider:
First, whether the defendant was attempting to arrest Ryan at or immediately before the time of the shooting. Second, whether Ryan was resisting an attempted arrest at the time or immediately before he was shot; tifiad, whether, if resisting an unlawful arrest, he used a much greater degree of force than was necessary. If the defendant was not attempting to arrest Ryan, but was going away from him to procure assistance, Ryan was not in the position of one whose attack could be justified. If an attempt at arrest had been made by the defendant and he afterward started away from Ryan and indicated an intention to leave him, the situation would not authorize an assault by the latter. If the violence and extent of resistance were out of all proportion to the necessity of the case and the circumstances indicated that Ryan was seeking or provoking a quarrel, the right of justification would be lost: Commonwealth v. *135Wright, 158 Mass. 149 (33 N. E. Repr. 82); Commonwealth v. Crotty, 92 Mass. 403; Bad Elk v. United States, 177 U. S. 529 (20 Sup. Ct. Repr. 729); 1 Wharton Criminal Law (9th ed.), sec. 649.
It is not the duty of an officer, when not exceeding his authority, to fly when assaulted. He may defend himself and use such force as may be necessary for that purpose. He is not justified in taking life except when the assault is so violent as to apparently put him in danger of death or great bodily harm. But the law does not require him to flee to the wall.
We are of the opinion that the jury should have been permitted to pass upon the questions above indicated. The charge of the court must have left the impression on the minds of the jury that the defendant had arrested or was attempting to arrest Ryan; that the latter’s attitude was one of resistance to an unlawful arrest. The evidence bearing upon the actions of the parties at the time should have been submitted to the jury for their consideration with proper instructions as to the rights of the parties.
The second assignment of error is therefore sustained.
The third and fourth assignments do not req uiz’e consideration.
The judgment is reversed and a venire facias de novo ordered.