No like in vanilla, because the animation only covered the actual settlement, you could click an adjacent army next to: 1) your own beseiged army (in the town), and 2) the enemy's army (beseiging the town), and still use your beseiged high level general to command a sally (and benefit from his traits as commander), while still having your reinforcements (w/o a general for exaggeration) in the battle. However, in my EB experiences thus far, whenever I try to do this strategy, under certain conditions, I'm unable to place my army in the above mentioned scenario because the animation for the seige equipment around the town (symbolised in vanilla by pikes surrounding the walls; vast seige works in EB), blocks the tile (and my pointer by making it think the tile is part of the settlement), will not let my army place itself on the red marker next to the enemy army... ... thus I am forced to directly attack with my reinforcements in order, which causes my units to be separated and w/o the trait benefits of my general... A frustrating issue indeed.