The Boer Republics successfully resisted British encroachments during the First Boer War (1880–1881) using guerrilla warfare tactics, which were well-suited to local conditions. The British returned with greater numbers, more experience, and new strategy in the Second Boer War (1899–1902) and, although they suffered heavy casualties through attrition, they were ultimately successful. Over 27,000 Boer women and children died in the British concentration camps.