To directly attack [the city of] Huáng Lóng
To directly attack the enemy's stronghold
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战争初期，我军採取直捣黄龙的战法，越过众多据点，直攻敌人巢穴，把敌人打得溃不成军 | Zhànzhēng chūqí, wǒ jūn cǎiqǔ zhídǎohuánglóng de zhànfǎ, yuèguò zhòngduō jùdiǎn, zhí gōng dírén cháoxué, bǎ dírén dǎ dé kuìbùchéngjūn
In the beginning stages of the war, our army decided to take the approach of directly attacking the enemy base. We passed many strongholds and directly attacked the enemy lair, and we managed to utterly crush them
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There is a LOT of history in this chengyu, and I've only covered the absolute bare minimum for the story to make sense. (Like, a whole TV show has been made about 岳飞 (Yuè Fēi), the general in the story.) I strongly recommend reading on the Jin-Song Wars and related info for additional context
《宋史》(Sòng Shǐ, or the "History of Song"), a work written by the high-ranking Yuán Dynasty (元, 1271 - 1386) politician 脱脱 (Tuō Tuō, or Toqto'a). The piece documents the history of the Sòng Dynasty (宋, 960 - 1279). Note: The Yuán Dynasty was founded and ruled by Mongols, not ethnic Chinese. 脱脱/Toqto'a is a Mongol name.
During the Sòng Dynasty (宋, 960 - 1279), there was a group of Jurchen people (女真, nǚ zhēn) that lived in the north of modern-day China. In 1115, the Jurchen founded the Jīn Dynasty (金, 1115 - 1234), and they soon launched an attack on Sòng. In the beginning, the Jīn defeated the Sòng soundly, even managing to capture the emperor and a significant number of members of the imperial court. However, some members of the Sòng royal family were able to escape, and they fled to the south of China, re-established their government, and resumed attacks on their invaders.
One of the Sòng generals leading the counter-attacks was named 岳飞 (Yuè Fēi). He had reportedly risen from humble beginnings to become a soldier and then a great military leader, and he reportedly treated his soldiers extremely well while also maintaining a strict form of discipline. In his battles against the Jīn, he managed to recover a great deal of the land that the Sòng had lost, and after one particularly decisive victory, it seemed like retaking even more land from the Jīn was just a matter of time. This made 岳飞 ecstatic, and he told his troops to march directly to 黄龙 (Huáng Lóng, the capital of the 金 Dynasty).
However, the current Sòng emperor began to fear that if 岳飞 were successful, the the emperor that the 金 had taken captive would be released, and a power struggle would ensue. He sued the 金 for peace, 岳飞 was ordered to return home, and the attack on 黄龙 never happened.