Well, yes, technically perhaps so…but I had good reasons for doing so.
Firstly, I knew that I currently had an advantage in the centre and on the right, so I wanted to win those battles, reaping as many coins as possible to set me up nicely for a climactic fight on the left from a position of power.
Secondly, Si is a canny player, and I was a bit overexposed on the left (hence the cataphract crisis), with three of my units facing six of his. I’ve been caught by that before: seemingly winning the battle to suddenly find one of my flanks collapsing and losing the game before I quite realised what was going on!
Finally, I was ceding ground for time - time for my right to wipe out the legionaries there and perhaps get back into the centre to smash the Romans from the right (didn’t happen, as we’ve seen above) - and forcing the situation where, for a short time at any rate, six of his units faced empty air whilst my withdrawing Knights would hopefully contribute to the fight in the centre.
And boy, was I right to do so!
Si slammed his right-centre (facing my left) forward, and I was soon facing a major assault across my left-centre that I only managed to withstand with the help of the Knights from the left that, had I not withdrawn them, would have been stuck embroiled with Si’s veteran light cavalry somewhere up on the far left side of the table.