A treaty was signed with the Boers of Griqualand in 1843 and an agreement was made with the British in 1853 following a minor war. The disputes with the Boers over land, however, were revived in 1858 with Senekal's War and again, more seriously, in 1865 with the Seqiti War. The Boers had a number of military successes, killing possibly 1,500 Basotho soldiers, and annexed an expanse of arable land which they were able to retain following a treaty at Thaba Bosiu. Further conflict led to an unsuccessful attack on Thaba Bosiu and the death of a Boer commandant, Louw Wepener, but by 1867, much of Moshoeshoe's land and most of his fortresses had been taken.