Katyn played a really bad game. I think he forgot where the retreat button was! I hate playing him. He's a Wehr only player that builds Bunker Cities and camps worse than any Brit. Just makes it a really Boring game! Well played. You owned him totally.
Tbf, regarding the retreating issue, I think lag was an issue. I had several instances where I was mashing the retreat button repeated and my units were just standing there.
But yeah, I was able to take full advantage of his overly conservative game plan and beat him pretty handily. THere were a few times if he had pushed more aggressively, I would have had more trouble but he gave me time to recover.