Back on to the topic of Return of the Jedi, it is still a great SW movie, OT or SE in my opinion. The ewoks are simply something that are more child friendily, like C3PO or R2D2. Also, it is not inconceivable they beat the legion of the Emperor's best stormtroopers because one legion is nothing compared to what would be thousands of Ewoks I am sure. It is simply a numbers game. Also I do think logs hitting Imperial Walkers is definately possible, we know from the movie they must be much heavier then regular Earth ones, otherwise the Walker head would not be smashed.