Lincoln was calling out the troops 10 years after he died? Neat trick. But what about the confederate call for 100,000 troops issued by their congress on March 6, 1861?
They knew an invasion was coming and acted in preparation. Southerners waited in close anticipation to hear what Lincoln's inaugural would say. They anticipated either a continuation of the relatively passive Buchanan administration (Buchanan himself believed that secession was wrong but also that he was largely powerless to do much against it) OR a new policy of greater activism and aggression. Lincoln gave them the latter when he pledged he would use force to collect the revenues. The southerners immediately telegraphed to Montgomery the message "inaugural means war" and directed them to prepare for an aggressive act against the south by Lincoln.