Fleet X dislodges Army Y when supported by Fleet Z. An exception is during Equinox, when Army Y has cut support from the convoy of Gamma to Kappa, at which point armies are transmuted into pansies and do nothing, but only if given a convoying attack support order, if they are doing a hold convoy attack, or even the support convoy attack, on any day than Equinox (solistices are opposite, in virtually every way except for the similarities with Equinox) result in the dislogding of fleet kappa. But if there's an additional move from adjacent ttero.....ugh
And I mean I find Axis and Allies to be an excessively simple game.