Knowing she must soon stop or risk his death by overexertion, Si'Wren turned her head to look back and saw many attackers separating themselves from the battle to ride after her, and cold fear filled her soul.
"Si'Wren of the Patriarchs"
Roland Cheney
As I was much reduced by chronic diarrhoea and overexertion, I was much pleased at the prospect of remaining at Gaffat, instead of campaigning during the rains.
"A Narrative of Captivity in Abyssinia With Some Account of the Late Emperor Theodore, His Country and People"
Henry Blanc
The doctors, who had recently been urging him to find new interests and activities, were now warning of the dangers of overexertion.
"Space Viking"
Henry Beam Piper