An event I missed. Mexican forces, of some kind, attack San Ygnacio, Texas on June 15, 1916

I managed to miss this, but this is the even that lead to the National Guard being called up almost immediately thereafter.

In spite, of perhaps because of, the Punitive Expedition, about 100 men of undetermined Mexican loyalties, perhaps Constitutionalist or perhaps Seditionist, attacked the town which was defended successfully by the 14th Cavalry.  Casualties were generally light on both sides during the battle, although four Americans and six Mexicans were killed.

The raid served to heighten already high tensions, which would be further inflamed by the events at Carrizal a few days later.