I cleared these golems on day 8; Uranist was a bit ahead of me. They are easily defeated by a single obsidian gargoyle. There's an interesting tactic called the "evasion tactic." The main thing is that your creature's speed should be 3 or more higher than the enemy's, and its initiative should be somewhat higher.
You cleared them a bit late... I use this tactic to defeat all non-speedy creatures....
Added 7 minutes later
Wow! On the 9th day! How is that possible? You can't even reach the Overlord in 9 days! Everything is clear. I came in last place. Please explain how this is possible? Angels will tear everyone apart; they fly fast. The Overlord has 500 gremlins, and they defeat everyone! Not to mention the golems.
Angels will suffer losses, with a maximum of 2 gremlins lost.... I used the Summon Fire Elementals and Raise Dead spells (or mines, if you prefer).
I controlled the gremlins, and they helped me defeat the golems, taking out 33-36 at a time, and I countered the golems with djinn.