advance guard

noun

1. a body of troops going before the main force to clear the way, guard against surprise, etc.

advance guard

noun

1. a military unit sent ahead of a main body to find gaps in enemy defences, clear away minor opposition, and prevent unexpected contact

2. a temporary military detachment sent ahead of a force to prepare for a landing or other operation, esp by making reconnaissance

Word History and Origins

Origin of advance guard¹

First recorded in 1750–60

Related Words

• forefront 
• front line 
• vanguard