Petit serjeanty refers to the tenure of lands of the crown, by the service of rendering annually some implement of war, as a bow, an arrow, a sword, a flag, etc.
The following is an example of a case law referring to petit serjeanty:
Petit serjeanty differed from grand serjeanty, in that the service rendered to the king was not of a personal nature, but consisted in rendering him annually some small implement of war, as a bow, sword, arrow, lance, or the like. [Maryland Coal & Realty Co. v. Eckhart, 25 Md. App. 605, 607 (Md. Ct. Spec. App. 1975)].