Heads up Chopstick, got some bad news for you. I tested hell out of that WWII soon as I got home this afternoon. Chopped a 10" diameter seasoned oak log, an old hickory axe handle, and a 2" diameter section of an ironwood sapling. Chopped until the sweat ran down in rivers. Took it in the house, wiped it down, gave it a few light strokes with one of my homemade chakmas, stropped it, and the hairs were virtually leaping off my arm to get out of it's way. No damage, nor even any significant dulling. I'm wore out and nursing a cold beer, it's whining like a hungry mutt, wanting to go again. Magnificent blade, it bites as pretty as it swings. I'm not surprised, it was made by the best.
Now, what went wrong? Maybe the hunk of wood you were chopping on had knots in it. Even softwoods like pine can have hard knots in it that'll booger up the edge on the best swung axe/khukuri. Could be you were hitting an embedded nail/screw, a high probability in old used lumber. Checking the wood before you start chopping is like checking to see how deep the creek is before you dive in. Both can help you avoid a big pain in the neck.
Sarge