Drill is best when you have a big tech edge. Drill infantry are better against longbows and muskets than combat infantry. The other edge in drill is the XP boosts. When you have a D4 unit at the sweet spot where you have like 99% combat odds to win, AND you get 3XP from a win, they're great. Other time I use drill a lot is ships. I'd rather a D3 battleship than a C3 battleship most of the time (if only drill3 opened up blitz like C3 does).
Flanking is good, as people mentioned, for tougher battles. F1/2 cavalry have 60% chance to win any battle, which isn't that bad when going against tough units. It's situational, but when you need it, it's great. Plus, you need it on some cavalry if you're up against high first strike units (since cavalry don't have the immunity).
Flanking is good, as people mentioned, for tougher battles. F1/2 cavalry have 60% chance to win any battle, which isn't that bad when going against tough units. It's situational, but when you need it, it's great. Plus, you need it on some cavalry if you're up against high first strike units (since cavalry don't have the immunity).