War of Sharpened Hearts

The 'War of Sharpened Hearts' was a Dalek conflict. The Fifth Doctor visited the vid-archives on Riften-5 and saw research papers on the genetic tests that had been run on captured Dalek specimens after the war. When the Kaled mutants had been scooped out of their metal shells and examined, it had turned out that every single one had been grown from male tissue. (PROSE: Christmas on a Rational Planet)