Q: Given a context passage, generate a question from the passage such that its answer is shortest continous span from the passage.
The Siege of Paysandu began 3 December 1864, during the Uruguayan War, when Brazilian forces (under Marquis of Tamandare) and Colorado forces (under Venancio Flores) attempted to capture the city of Paysandu in Uruguay from its Uruguayan Army defenders.
A:
What year did Siege of Paysandú start?