(1) Frontier Fortress
(2) Answer: The whole poem depicts the scene of the border guards returning from the battle. The first two sentences describe the vastness of the desert and the wild geese flying high, which expresses the joy of the victor and the homesickness of the conquerors; the second two sentences describe the sun rising in the southeast and the coldness of the iron clothes, which not only expresses the neatness of the military appearance on the magnificent background, but also implies The hardships of military life. The poem captures the rich images with the characteristics of the frontier fortress, and creates a majestic and magnificent artistic conception through the contrast of joy and sorrow, warmth and cold, sound and color, and expresses the generous and tragic feelings of the expedition.
(As long as the meaning is correct)