《资治通鉴·魏纪·魏纪一》
黄华企图救援张进，又顾忌西部张恭的部队攻击后路，所以不敢前去救援，只好投降了。
黄华欲救张进，而西顾恭兵，恐击其后，故不得往而降。
Huang Hua attempted to rescue Zhang Jin, however, because he worried that Zhang Gong’s troops in the west would attack his rear, he did not dare go to rescue him, and thus could only surrender.
<s>[INST] Kindly elucidate the central themes in this passage in English: 黄华欲救张进，而西顾恭兵，恐击其后，故不得往而降。 [/INST] Huang Hua attempted to rescue Zhang Jin, however, because he worried that Zhang Gong’s troops in the west would attack his rear, he did not dare go to rescue him, and thus could only surrender.</s>
Kindly elucidate the central themes in this passage in English: 黄华欲救张进，而西顾恭兵，恐击其后，故不得往而降。
user
Huang Hua attempted to rescue Zhang Jin, however, because he worried that Zhang Gong’s troops in the west would attack his rear, he did not dare go to rescue him, and thus could only surrender.
assistant