Patrol

Chamber's Etymological of the English Language · 1895 · p. 376
pa-irol', v.i. to go the rounds in a camp or garrison,— v.i. to pa round as a sentry \~pr.p. patrOll'ing pa.t. and pa.p, patrolled. n. the marching round of a guard in the night: the guard which makes a patrol. [Fr. patrvuille a patrol, Patrouiller, to march in the mud, through a form patoutller, from patte, the paw or foot of a beast, which is from ieut. root pat, found in Ger. patsche, little hand
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