Human: How did Gordon's black Sudanese troops prove to be his best troops at Khartoum? Assistant: 
Gordon's black Sudanese troops proved to be his best troops at Khartoum because they were the only troops that were willing to fight for him. The black Sudanese troops, many from what is now South Sudan, proved to be Gordon's best troops at Khartoum because they were the only troops that were willing to fight for him.