Tang Conquest of Guanzhong

Timeline

1. 618Chang'an · ShaanxiAfter proclaiming emperor, Li Yuan made Chang'an his capital, appointed officials, and won over soldiers and civilians, initially establishing administrative control over the Guanzhong heartland and beginning to reorganize surrendered Sui troops.
2. 618–619Tong Pass–Northern Wei · ShaanxiSui general Qutu Tong held Tong Pass with his troops; after months of fighting, the Tang army forced his surrender and successively pacified remnant Sui forces in northern Wei and Longyou, largely removing the threat in eastern Guanzhong.
3. 619Guanzhong · ShaanxiBy the second year of Wude, the Tang army had successively pacified separatist armed forces and disobedient local factions across Guanzhong; the whole region came under effective Tang rule and became the strategic rear for the eastern campaign against the Central Plains.