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In page Bartolina Sisa:

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On 13 March 1781 Sisa and Túpac Katari establish a siege around the city of La Paz, then capital of Charcas and seat of the colonial Real Audiencia with a force of some 20,000 men, later to be joined by other 80,000. The city is located on an enclosed valley with limited access, and the siege was able to completely block all movement to and from the city. During this time, Sisa organised military camps around all the mountain passes that led to the city and acted as main command of the indigenous forces.[1] On 21 May, a Spanish military force attempted to dissolve the siege and capture Sisa, failing to do so.[citation needed]