What does it mean to "empty the East China Sea immediately, climb high and look far, and be safe"

1937 during the War of Resistance against Japanese Aggression period, Tang Shizun, commander-in-chief of the 23rd Kuomintang Army, led his troops out of Sichuan to resist Japan, stationed near Huangshan, and his headquarters was in Tunxi (now under the jurisdiction of Huangshan). Because Tang likes to make friends with literati and love calligraphy, he used his leisure time to visit Huangshan Mountain many times during his command of War of Resistance against Japanese Aggression, the third war zone. When he saw Ma Feng roaring like a war horse, as if he were fighting with the Japanese invaders at once, he touched the scene and improvised a couplet of "The East China Sea is empty, climbing high and looking far". "Immediately" clearly describes the peak of immediately, which is a metaphor for the anti-Japanese armed forces or anti-Japanese generals to immediately cross the knife in front of the enemy. "East Sea" means that Japan is in the east of the East China Sea; "Empty" is to despise the enemy and firmly believe that the war of resistance will win. "Climbing high and looking far" is a simile to climb the top of Huangshan Mountain and see Taiping County in the north of the mountain. It is a metaphor to hope to defeat the Japanese invaders at an early date and realize world peace. When Tang Shizun finished writing, his meaning was still unfinished. At that time, he contributed 1000 yuan and asked young masons in Huangshan to carve these ten words on the cliff on the mountainside of Lima Peak. It took more than a dozen masons half a year to finish it. Tang Shizun made a certain contribution to War of Resistance against Japanese Aggression, but he was not a calligrapher, but he made these ten characters the only calligraphy stone carving in Huangshan, which filled the blank of few characters calligraphy at the peak of Huangshan and became a landscape.