古北口長城蟠龍山段密云306號敵臺（11月14日攝）。古北口長城坐落于北京市密云區古北口鎮。長城抗戰是中國抗日軍民在長城沿線抗擊日本侵略者的斗爭，是早期抗日斗爭的重要組成部分。1933年，盤踞在我國東北的日寇侵占熱河后，一路長驅直入。冷口、喜峰口、古北口等地爆發長城抗戰。古北口長城上下，一批戰爭遺跡、革命文物、紀念場所等，訴說著這段歷史。[新華社記者李京攝]

This photo taken on Nov. 14, 2023 shows a watchtower at the Panlongshan section of the Gubeikou Great Wall in Beijing, capital of China. Gubeikou Great Wall is located in Gubeikou Town, Miyun District of Beijing. The defense of the Great Wall is an important part of the early Chinese People's War of Resistance Against Japanese Aggression. In 1933, the Chinese troops fought against Japanese invaders at places including Lengkou, Xifengkou and Gubeikou of the Great Wall. (Xinhua/Li Jing)