The capture of Tientsin played a crucial role in the Boxer Rebellion, a violent anti-foreigner uprising in China that emerged in the late 19th century. The Boxers sought to expel foreign influence and Christianity from China, leading to increased tensions with international powers. In response to the deteriorating situation and the siege of foreign legations in Beijing, the Eight-Nation Alliance garnered support from various countries to safeguard their interests. This multinational force comprised troops from Japan, Russia, the United Kingdom, France, the United States, Germany, Austria-Hungary, and Italy.

On July 14, 1900, the Eight-Nation Alliance launched a coordinated attack on Tientsin, which had become one of the key battlegrounds in the conflict. Tientsin's strategic location along the Hai River made it critical for supply lines and communication between Beijing and the coast. The alliance faced fierce resistance from Boxer forces and local militia, but their superior organization and firepower ultimately led to a swift capture of the city. The fall of Tientsin not only secured the alliance's control over the area but also allowed them to move towards Beijing, setting the stage for the next phase of military actions.

The capture highlighted the capabilities of the multinational force, demonstrating the effectiveness of their coordination despite differing national interests. Following this victory, the alliance would proceed to Beijing, where the situation escalated, leading to further military engagements. The repercussions of the capture were felt throughout China and the world, deepening foreign intervention and shaping the future of Sino-foreign relations.