A coordinated Taliban assault on the northern Afghan city of Kunduz on Monday dealt a setback to the Western-backed government in Kabul. As The Washington Post's Tim Craig reports, the fight to regain control of the key city will become one of the Afghan military's "biggest tests" in the 14-year battle against the Taliban.

[U.S. military launches airstrike on Kunduz after Taliban assault]

Read more:

The bloody history of Kunduz, from Afghanistan’s ‘Convoy of Death’ to now

Chart: How much more the U.S. has bombed the Islamic State than the Taliban

Once relatively secure, Kunduz now in Taliban cross hairs