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Which of William I’s brothers died fighting Spanish forces near Nijmegen in 1574?

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Portrait of William I, Prince of Orange, by Adriaen Thomasz Key. He wears a dark embroidered coat, a white ruff collar, and a black cap, with a trimmed beard and mustache. — William I Portrait of William I, oil on panel by Adriaen Thomaszoon Key, c. 1579; in the Rijksmuseum, Amsterdam.

In April 1574, two of William I’s brothers, Louis of Nassau and his younger brother Henry, were killed while fighting Spanish forces at the Battle of Mook, located near Nijmegen.1