I was robbed by my soldiers.

Consider that a good number of Santa Anna's troops were convicts---thieves, perhaps even murderers, etc.--- who had been promised their freedom if they joined the campaign. There's the old saying, a tiger never changes its stripes. The available accounts agree that the post-battle looting was something of a frenzy.

You know that's what I've always assumed, but Allen's point is one I never thought about.

I think it's a rather safe assumption, that the grenadier battalion was serving as the HQs guard/ security force. With them serving as the reserve for the assualt - who was securing the HQ's baggage? Other units left their untrained men in their respective camps and they would have been responsible for securing their units baggage, but there would have been no untrained grenadiers. Could some bold theif have simply pilfered some of the staff officers baggage during the battle?

That's a good point, Gary, unless we assume that the presence of soldiers in the camp or around officers' quarters would have dissuaded townsmen from attempting such looting. As you say, the rather cryptic Almonte leaves us another mystery.

Allen

Perhaps the personal humiliation had something to do with it: "I was robbed by my soldiers"

That's what I mean, there's so much he could have recorded, like de La Pena, good bad and otherwise, but instead the only thing that mattered was his personal misfortune.

One thing to consider in all this: the only accounts we have of the situation back at Almonte's quarters---which were also Santa Anna's---during the battle were given by Almonte's cook, Ben. After he gave Santa Anna and Almonte coffee, the two officers went off to begin the assault. Ben tells us that he stayed in the house, and looked through a window at the lights and explosions of the battle. There WAS something of a generally clear line of sight from the north-facing windows of the Yturri House, where headquarters was, to the hill upon which the Alamo sat, to the east.
One assumes that if Almonte bedded in a room of the house, his property was there. If the soldados guarding the place robbed it, there is no mention of it anywhere else, and Ben certainly didn't mention it.
So I still lean on Almonte being robbed---he doesn't really say what he was robbed of---during the battle or its immediate aftermath. In the madness that prevailed in the compound that morning, soldados were ripping clothing and other things from noncombatants, from baggage and drawers, and firing at times so wildly that some of their own men and officers were in peril. It was still dark, smoky, and frenzied enough for an angry, fired-up fusilier or grenadier to rip off an officer's sash, or purse, or whatever, and run off, unrecognized, and with impunity.