Posse comitatus

These latin words signify the power of the county; the sheritf has authority by the common law while acting under the authority of the writ of the United States, commonwealth or people, as the case may be, and for the purpose of preserving the public peace to call to his aid the posse comttatus. But with respect to writs which issue, in the first instance, to arrest in civil suits the sheriffis not bound to take the posse comitatus to assist him in the execution of them; though he may if he pleases, on forcible resistance to the execution of the process. 2 Inst. 193; 3 Inst. 161.° Having the authority to call in the assistance of all, it seems to follow, that he may equally require that of any individual; but to this general rule there are some exceptions, persons of infirm health, or who want understanding, minors under the age of fifteen years, women and perhaps some others, it seems, cannot be required to assist the sheriff, and are therefore not considered as a part of the power of the county. Vin. Ab. Sheriff B. Although the sheriff is acting without authority, yet it would seem that any person who obeys his command, unless aware of that fact, will be protected. Whether an individual not enjoined by the sheriff to lend his aid, would be protected in his interference, seems questionable; in a case where the defendant assisted sheriff’s officers in executing a writ of replevin without their solicitation, the court held him justified in so doing. 2 Mod. 244. Vide 6 Bac. Ab. 169; Hamm. N. P. 63.