lol. im a having a hard time too when i started this game in early September. I think the used word should be change.
disengage-->active, activate, activated
things like 'target disengaged unit' should be 'target active unit'
things like 'engage target disengaged unit' should be 'deactivate target active unit'
English is not my native language, so it took me a quite sometimes to grasp the 'engage disengage' idea. I think the wording should be change to easier and more understandable language.
PS: I'm sorry that I wasn't born in either America or England. My English are so bad i could kill myself.