If that guy really did read books, he should know the legion on Endor were killing the Ewoks and forcing them to retreat and only by Chewie hijacking an AT-ST did the battle turn around. The movie didn't really do a good job on portraying that.
I don't think you read the books.
If you read RotJ novilization you would see that the Storm Troopers never have them in retreat.
Here are a couple of exerts that take place before Chewbacca gets on the ATST
The little bears were hanging on the legs of the Imperial Walkers, hobbling the appendages with lengths of vine, or injuring the joint mechanisms by forcing pebbles and twigs into the hinges. They were knocking scouts off their bikes, by stringing vine between trees at throat level. They were throwing rocks, jumping out of trees, impaling with spears, entangling with nets. They were everywhere.
On Endor, the battle of the bunker continued. Stormtroopers kept irradiating Ewoks with sophisticated weaponry, while the fuzzy little warriors bashed away at the Imperial troops with clubs, tumbled walkers with logpiles and vine trip-wires, lassoed speeder bikes with vine-ropes and net-traps.
Meanwhile the Ewoks had erected a primitive catapult at the other side of the field. They fired a large boulder at one of the walkers - the machine vibrated seriously, but did not topple. It turned, and headed for the catapult, laser cannon firing. The Ewoks scattered. When the walker was ten feet away, the Ewoks chopped a mass of restraining vines, and two huge, balanced trunks crashed down on top of the Imperial war wagon, halting it for good.
The next phase of the assault began. Ewoks in kite-like animal-skin hang-gliders started dropping rocks on the stormtroopers, or dive-bombing with spears. Teebo, who led the attack, was hit in the wing with laser fire during the first volley and crashed into a gnarled root. A charging walker clumped forward to crush him, but Wicket swooped down just in time, yanking Teebo to safety. In swerving out of the walker's way, though, Wicket smashed into a racing speeder bike - they all went tumbling into the dense foliage.
And so it went.
The casualties mounted.
That's really the only line that would indicate that the Ewoks even lost anyone. Other then that the Ewoks kick even more *** in the Book then they do in the Movie.
They felled trees on their foes. They dug pits which they covered with branches, and then lured the walkers to chase them until the clumsy armored vehicles toppled into the dug-outs. They started rockslides. They dammed a small, nearby stream, and then opened the floodgates, deluging a host of troops and two more walkers. They ganged up, and then ran away. They jumped on top of walkers from high branches, and poured pouches of burning lizard-oil in the gun-slits. They used knives, and spears, and slings, and made scary war-shrieks to confound and dismay the enemy. They were fearless opponents.
Their example made even Chewie bolder than was his wont. He started having so much fun swinging on vines and bashing heads, he nearly forgot about his laser pistol.
He swung onto the roof of a walker at one point, with Teebo and Wicket clinging to his back. They landed with a thud atop the lurching contraption, then made such a banging racket trying to hang on, one of the Stormtroopers inside opened the top hatch to see what was happening. Before he could fire his gun, Chewie plucked him out and dashed him to the ground - Wicket and Teebo immediately dove into the hatch and subdued the other trooper.
Ewoks drive an Imperial Walker much the way they drive speeder bikes - terribly, but with exhilaration.
Yeah pretty clear that the Ewoks own the Stormtroopers.