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

<attack_by_fire_command-gapsout_null-gapsin_null>

<movement_verb> <here_there_location> and <engage_verb> <enemy_loc-gapsout_null-gapsin_null> <by_fire_phrase-direct>

<movement_verb> <to_prep> <engagement_loc-gapsout_null-gapsin_null> and <engage_verb> <enemy_loc-gapsout_null-gapsin_null> <by_fire_phrase-direct>

<set_up_verb> <base_of_fire_phrase> <engagement_loc_mod-gapsout_null-gapsin_null> and <engage_verb> <enemy_loc-gapsout_null-gapsin_null>

<basic_attack_by_fire_command-gapsout_null-gapsin_null>

<engage_verb> <enemy_loc-gapsout_null-gapsin_null> <by_fire_phrase-direct>

<basic_attack_by_fire_command-gapsout_np_gap-gapsin_np_gap>

<engage_verb> <enemy_loc-gapsout_null-gapsin_null> <by_fire_phrase-direct>