The biggest battle I ever played was between the Ferengi and the Federation. The Federation had 13 Defiants(clocked) and the Ferengi had 216 ships (150 commands, 50 fast attack and support ships). It took me 8-9 turns to eradicate them all and I ve lost only one defiant. 9 Defiants had Legendary 16000 status, and the 3 most powerful had 26000.

I had an interesting battle between one Oberth class and one Ferengi scout and it lasted for like 20 turns flying around each other, it was my LONGEST battle (really interesting) but my biggest one was like 18 Sovereigns, 27 Defiants , 27 Galexy-Xs and 9 Nebula's against a cube...I won...by a hair.
-Jega