barrier troops / blocking detachments (units) / anti-retreat forces

retreat, to intercept the retreat

attachments and detachments

blocking force

blocking position

blocking slide

blocking effect correction

blocking signal

blocking

fixed blocking fire

avenue of retreat

cover the retreat / withdrawal

fighting retreat

interrupt the enemy's line of retreat

retreat

retreat in disarray

confused retreat

pell-mell retreat

make good the retreat

border (security) forces /troops

ground forces air defense troops

civilian relief units

combat-ready units

designated units

fill out units

fix enemy units

formed police units

halting or bunching (of units)

intelligence staff officer (brigade, battalion & armored cavalry units level) (S2)

internal security units

multinational special units operations (MSUOPS)

rotation of units

combined arms units and formations continuous artillery combat support