6th year of Adelaathira (year 56).
Of course I picked a sweet spot. River, somewhat warm woodland, wildlife moderate.
Things are going well. Picked a high hilltop, removed all the ramps. Built two bridges per entrance that retract. Built a catwalk leading to the bridges, put up repeating spikes hooked up to some water repeaters. If they somehow get beyond the bridges (which are also repeating, now laced with spikes below), there cage traps for them which are set up my barracks for "training" sessions once the creatures inside are pitted. Mwuhahahah.
At first things were going great, until I realized floodgate water repeaters destroy water, I was in mid siege and I had to stop one bridge/spike trap from repeating. I killed off the enemy with the other entrance.
Afterwards I thought, I'll just route some water to my resoviour that powers the water for my repeaters. Next siege, I kicked ass, yet... I ended up draining all those sources and still 2 years later, they are bone dry.
Luckily, I had a better long term plan to route water from the river. Which was on the other side of the map. I built a 1 tile width water source all the way to my fortress, walled off. Had to use water pumps.
Then some bastard trolls showed up and broke one of my water pumps. But I had plenty of water, made quick work of them and killed off the rest with the spikes. Built walls to block off the path to the screw pumps.
And now I'm in the golden age of my fortress.
I'm working on looking for a magma source to build some forges. So I'm working on a bridge/repeating spikes in the caverns.
Btw, iron spikes.