[MeneMeneTekelUpharsin]

The Mexican troops likely were protecting smuggling cartels.

Exactly. Something should have happened with 30 minutes of the two groups parting. After wiping out the five, tell Mexico the very next time it happens, the entire unit to which the perps belong will be killed. We have Casper Milktoasts for military leaders.

[MeneMeneTekelUpharsin]

And, I can tell them in fluent Spanish.