convoy (n.)

early 16c., "the act of guiding or escorting for protection," from convoy (v.), late 14c., from Old French convoier, from Vulgar Latin *conviare, literally "go together on the road," from Latin com "with, together" (see com-) + via "way, road" (see via). The meaning "train of ships or wagons carrying munitions or provisions in wartime under protection of escort" is from c. 1600.