The rules that use the category "<engage_verb>" are:

<attack_by_fire_command>

<movement_verb> <to_prep> <engagement_loc> and <engage_verb> <enemy_loc> <by_fire_phrase>

<set_up_verb> <base_of_fire_phrase> <location_prep> <engagement_loc> and <engage_verb> <enemy_loc>

<basic_attack_by_fire_command>

<engage_verb> <enemy_loc> <by_fire_phrase>