The Immediate Action Drill series of articles are written by local milsim player Dave. Many thanks for his time and the use of his work.
IAD Situation 3
Patrol and enemy detect each other at same time and at such close range that breaking by clock system or fire and maneuver is not appropriate.
IAD: Immediately assault the enemy position. If the enemy stands their ground, assault through their position. If the enemy retreats, attack up to their position and hold.
Subsequent action: Continue mission.