What is the next dialog turn? Conversation transcript:
[A]. What happened to Charles George Gordon in the Second Boer War?;
[B]. The defences Gordon had built with lines of earthwork, mines, and barbed wire presented the "Ansar" with much difficulty and their attempts to storm Khartoum failed, but the "Ansar" made good use of their Krupp artillery to gradually batter down the defences.;
[A]. What else did you find interesting?;
[B]. 
To counter Gordon's armoured streamers, the Mahdi built a series of forts along the Nile equipped with Krupp guns that over time proceeded to make it almost impossible for Gordon's navy to operate.