Snipers, snipers, snipers

So, promptly after missing both a 95% chance shot to kill a sectopod and an 85% chance weapon disable on it, said beast shot my assault and killed my best support. Obviously, my sniper then had to panic and kill my wounded assault

Heavy floaters come around and decide to say hi in overwatch. Of course, losing some of my best damage meant that I wouldn't be able to take care of both the sectopod and the floaters in one turn, so with my remaining support I suppressed the sectopod and killed a floater with my second assault. My heavy missed his second 67% shot to kill the heavy floater. Next turn, the sectopod misses but the floater critically wounds my heavy, leaving me with just 3 squadmates. I made the terrible mistake of trying to finish the sectopod with my sniper again. 2 95% chance shots miss, assault takes out the floater (I would have had him go for the sectopod but he wasn't close enough), and the support does the minimum damage possible on her weapon leaving the sectopod with 1 hp. Sectopod then kills both my sniper and support that turn. The only way for my assault to escape was by the sectopod, so I ran for some full cover. Sectopod blows up cover with artillery thingymabob and then shoots and kills assault. Left with only squaddies in barracks.
XCOM Enemy Within, normal Ironman (my first x-com game, had a few earlier restarts while figuring out the mechanics more fully)