Instructions: This task involves annotating the answer type to a given question that involve some kind of complex reasoning (including numerical reasoning). Note that the questions require looking at more than one part of the passage to answer. There are 3 possible answer types (i) spans, (ii) numbers and (iii) dates. If the answer can be found in the passage, label it as "span". If the answer is a number, label as "number". Similarly, label "date" if you think the answer to the given question is a date.
Input: Passage: In 1899 the regiment deployed to the Philippine Islands to help suppress a guerrilla movement in the Philippine-American War. The regiment returned to the Islands in 1905 and 1911. Though the 24th fought a number of battles in the Philippines, one of the most notable occurred on 7 December 1899, when nine soldiers from the regiment routed 100 guerrillas from their trenches.
Question: When did the regiment last return to the Philippine Islands?
Output:
date