In 1893 the French ordered their navy to sail up the Chao Phraya River to Bangkok. With their guns trained on the Siamese royal palace, the French delivered an ultimatum to the Siamese to hand over the disputed territories and to pay indemnities for the fighting so far. When Siam did not immediately comply unconditionally to the ultimatum, the French blockaded the Siamese coast. Unable to respond by sea or on land, the Siamese submitted fully to the French terms, finding no support from the British. The conflict led to the signature of the Franco-Siamese Treaty in which the Siamese conceded Laos to France, an act that led to a significant expansion of French Indochina.