A bit of factual history. Santa Anna's army numbered a little over 6,000 men. He used 5,000 or them trying to route the Alamo, and it took him 13 days. At no time did he EVER even approach 10,000 men, much less 30,000. Sam Houston dusted Santa Anna's britches with less than 4,000 men, and sent him back to Mexico with a spanking, his tail between his legs, and his ears trimmed.
Now! The history of the last president and this current one, is there is a better than even chance the purported troops will never be sent or will be stationed in a non operation function on the border.