“Our only expectation is to be martyred,” Mr. Tahir says in a video of him en route to Pakistan that was viewed by The New York Times. About a month later, he was killed by Pakistani security forces, his relatives said.

As a generation of fighters raised in war now finds itself stuck in a country at peace, hundredsof young Taliban soldiers have crossed illegally into Pakistan to battle alongside an insurgent group, according to Taliban members, local leaders and security analysts.

Like Mr. Tahir, many say they are determined to continue waging jihad — wherever in the world it takes them.

[Say, remember when Joe Biden claimed that the war was over because he ran away? Good times, good times. This is the same sequence of events that took place in the 1990s, and why their war eventually reached our shores. — Ed]