Gydion: Having the well near my staircase is actually a much better design. Plus, it gives me a much larger reservoir. It took a while to dig out, but definitely worth it.
I had a necromancer siege with two necromancers and a host of undead. I was a bit late on starting my military. I closed the drawbridge, and prepared to wait it out. The necromancers move incredibly slowly, but one finally wandered over by my side entrance where my 10 dwarf squad was stationed. None of them yet were axelords or spearmasters, but 10-1 odds... I sent them out to attack him. The lead axedwarf hit him a glancing blow in the leg. Apparently, they can actually run quite fast.
Three of the squad chased after him while the other seven finally gathered outside. That necromancer ran off the screen. While I was following along with the three, a two-humped camel skeleton wandered by and slaughtered the other seven squad members with some help of another skeletal animal. Two Hands made it into the fortress via the side entrance and proceded killing.
I likely could have stopped them, but the undead voracious cave crawlers made short work of that window I thought was a good idea. Don't have any screenshots of that though.
Underground reservoirs for interior wells are always so satisfying to build :) Currently I have 3, building a 4th and planning a 5th
Luckily I'm not in contact with a Tower on my embark, but I do have a morbid curiosity about facing them in battle. Once I'm a bit more settled I'm going to see if I can send a raiding party to one the one tower in my world.
OT, explored a space station last night