After the battle ended, you needed to hand in your weapon and then receive points; following that, if the commander re-assigned this weapon to you, only then would the weapon truly belong to you.
However, if the commander did not assign the weapon to you but to someone else, theoretically, he only had to compensate you with items of equivalent value to the weapon, without needing your consent.
To put it simply, the commander could take gold from you and then provide you with some scrap iron you couldn't use, which although individually worthless, could count as compensation when amassed in a certain quantity.
Besides the convoluted allocation of spoils of war, almost every other clause in the contract had some sort of issue, to a greater or lesser extent.
These contractual terms appeared completely normal on the surface, but if you pondered carefully, you could sense the problems within these stipulations.