1)
What is the question?
1.
Radak: How long will I see and hear these signs of war, i.e. You will not retract from Your anger?
2.
Malbim: How long will the king raise a flag for war and blow the Shofar? They will not succeed!
2)
What is the Nes?
1.
Rashi: It is gatherings who raise a flag to come to make war.
2.
Radak: Guards stand in tall towers and on high mountains, and when they see the enemy coming, they raise a flag so the Am will see, and they blow the Shofar so the Am will hear and be careful.