This is based on the list of known Texians killed at the Alamo found in Todish's ALAMO SOURCEBOOK. The list totals 185 men. If one accepts, as I do, the likelihood that the garrison really totaled about 240 men, then we have significant gaps in our knowledge. It is possible that a reinforcing group got into the Alamo near the end of the siege; one source suggested that Crockett had gone out and led them in. Nobody knows. The battle plays rather differently with 185 defenders versus 240. IF 50 or 60 reenforcements did get in, it is likely that they had their own officers and company organizations , which are also unknown. So what follows below is at best a skeleton or an outline of how the Alamo garrison might have been organized and commanded.
Garrison command and staff:
The garrison amounted to a battalion, and was staffed accordingly. LtCol Travis' subordinates included two majors (Evans, chief ordinance officer, and Jameson, chief engineer), two captains (Baugh, adjutant, and Blair, assistant ordinance officer), and two lieutenants (Melton, quartermaster, and Zanco, assistant ordinance officer). There was a full time surgeon (Pollard) and several physicians serving as privates in various companies. Sergeant Major Williamson was the senior NCO of the garrison.
In addition, there were several officers in the garrison who were not assigned to companies; several of them served as couriers but one assumes they had some responsible battle station when present. Lt Bonham is the most famous but there was also Captains Albert Martin and Robert White. There is some suggestion that White's company was a separate organization within the garrison.
The garrison was thus well provided with battalion-level officers, although of course it is much more difficult to command and control a force spread over the space of the Alamo compound, and particularly so against a night assault.
Artillery command:
Captain Carey's company of gunners (about 30 men) included a second captain (Dickinson) as well as two or three sergeants (one may have been an invalid) and two corporals. There were four major batteries (the chapel with three guns, the lunette with two guns, the northwest corner with two, and the north wall with three) plus the 18 pounder at the southwest corner. I assume that the Texians would have wanted an officer at each of those positions, and would guess further that the three ordinance officers would have doubled as battery commanders. The remaining single guns might have each had an NCOIC.
"Line" companies
The cavalry was organized into two companies, Seguin's and Forsyth's, but their combined strength was not much more than 20 men. Seguin had left as a courier and his men, probably fewer than 10, were led by two sergeants, Abamillo and Badillo. Forsyth's company had a full command roster (two lieutenants, a cornet, and two sergeants) but no more troopers than Seguin's. My GUESS is that the two companies were merged.
The remaining companies were Blazeby's (mostly composed of New Orleans Greys) and Bowie's and the Tennesseans and the Gonzales men. Blazeby had a lieutenant and two sergeants, Bowie was seconded by Captain Baker plus a lieutenant and a sergeant, the Tennesseans were led by Captain Harrison plus a lieutenant and High Private Crockett, and Lieutenant Kimball apparently commanded the Gonzales men by himself. These companies varied a bit in strength but averaged about 30 each.
I assume that each company had a sector to defend. The latest research, mostly incorporated into the Blue Moon 15mm model, indicates that long stretches of the wall had no firing positions, but the raised-palisade fortresses and nearby rooftops provided space from which an entire company could fight, and fight in several directions. My assumption, therefore, is that each company stayed fairly tightly deployed around its officers, rather than spaced out along the whole perimeter.
At any rate, I prefer to fight the March 6 assault this way. It never made sense to me that the garrison would be spread thinly along a too-long perimeter where commanders, particularly in the dark, could have almost no control over their men.
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