This conflict was between the British Empire, and by what's known today as Eastern Nigeria. The war began after increasing tension between British colonists, and Aro leaders after years of failed negotiations.
British Expedition to Tibet
1903 - 1904
British Indian forces had a mission to establish diplomatic relations
and trade between British Raj and Tibet
Herero and Namaqua Genocide
1904 - 1907
Herero and Namaqua Genocide is the first considered genocide of the 20th century.