Given the speed of the advance I think it would be a seriously incompetent commander who didn't have a good idea of the size of the invading force. Especially since the force have been raided numerous times by defending forces. Mind you, given military history that's not impossible. Also by this time Armstrong especially is probably glad of the chance of a chance of battle to end the demoralising crawl and win some glory.
Most of the raiders that have been nibbling at the edges have no contact with British high command. ATM they're doing this on their own. Gradually, there will likely be a system in place to connect the various locals, and send more, better armed guerrillas in.
Opps!
Although I'm rather surprised that Britain could organise a fuses operating from such a long distance.
Yes, it's tricky. It may be a guy with a cord on the bank, well hidden, who pulls on the cord and it sets off a detonator (of some sort). The guy is probably either a heroic volunteer - or expiating some serious crime...
I suspect other tech would be possible to do the same thing. I do know it's not trivial, before electricity...
[FONT=Arial, sans-serif]Note that General Gonzales has secret orders, which he was not at liberty to share with the Americans, that he is to avoid attacking British regular units, if at all possible. At the time he was given those orders, Mexico was hoping that they might avoid war with Britain entirely. Once the supply ships were attacked, the government knew that that wasn't possible, but they would LIKE to keep the intensity down. If they avoid attacking the British – if they just supply occupation troops after the US takes Louisiana, they are much less likely to face the wrath of the entire British Empire. Moreover, Mexico wouldn't put it past the gringos to set the British against Mexico, and then themselves make a separate peace. (Leaving Mexico to face the British alone.)[/FONT]
[FONT=Arial, sans-serif]So Gonzales is encouraged not to start anything. If fired at, he can defend; if he has to attack militia units, well, OK. However, he should only engage British regulars if he simply can't avoid it. Since the bridge is blown before any Mexican troops get on it, Gonzales doesn't have to explain why he didn't cross it. For which he is very glad. <g> If the British had NOT mined the bridge, he would have crossed, tried to only target militia, and the US/Mexican forces would almost certainly have carried the day. As is, he has a lovely excuse, and doesn't even need to admit what his orders are.[10] At the moment, he HAS Tejas (by arguable definitions), he has preserved the lives of his men, and the US hasn't got anything they can actually accuse him of. So he's pretty happy at having succeeded at steering between Scylla and Charybdis so far.[/FONT]
Rather surprised that Gonzales's orders discriminated between British regulars and militia, which are after all British citizens. Pretty certain that the British won't be making that distinction.
I think he's still very much between a rock and a hard place.
Steve
1) the Mexicans are grasping at straws. 2) the Red Coats may well be Great British (i.e. insular British). The militia are locals. The Mexicans have a serious hope that Parliament in London (and more to the point, Joe on the streets of Liverpool) will be more concerned with English/British than with colonials. They would be right iOTL, and they're partly right iTTL.
But, as is, Gonzales has managed to avoid killing ANY British of any description. One of the reasons he's happy.
Mexico keeps hoping that Britain will be occupied enough with the US that, as long as they keep their heads down, and are only reoccupying their own land (Tejas), that the Brits will be distracted enough to leave them alone. Or failing that, that the Brits will at least avoid punitive damages due to anger.
The land Mexico will lose will be more out of ... convenience than anger. I believe I've mentioned California.... Also, if any rebels manage to take over a state or two and petition for admission into the Magnificent Glory of the British Empire, why, it would be churlish to say no, wouldn't it....
Britain is going to take chunks of Mexico, but they are not going to be angry. There will be no expedition that lands and seizes Mexico city, e.g., unlike the Mexican-American war. There will be no indemnities paid to Britain (possibly to Tejas....)
The Mexicans ARE trying to finesse things, and it isn't going to work very well, but it is working some.