Categorize this text into one of the four categories sports, science, literature, or history.
The Battle of Gettysburg was an important event of the Civil War.
history
Complete the following task based on the instruction and optional input provided.### Instruction:
Categorize this text into one of the four categories sports, science, literature, or history.

### Input:
The Battle of Gettysburg was an important event of the Civil War.

### Output:
history