How is the US army going to stop the migrants?

Trump's executive order states that immigration is an invasion and America's sovereignty is under attack. In other words immigrants are an invading army, just like his pal Putin's invasion of Ukraine.

He's now sent the army to, "immediately repel, repatriate and remove" those individuals.

But given the style of dark language he's using, what exactly does he mean by "remove"? He's already said repel and repatriate, so "remove" sounds rather ominous, especially since he's sending thousands of troops. How exactly does an army stop an invasion?
How is the US army going to stop the migrants?
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