Herbert was killed in September 1622 at the Siege of Heidelberg, where he was fighting on behalf of King James' son-in-law Frederick V of the Palatinate.
[1] His defense of Heidelberg Castle was destroyed by the Imperial-Spanish troops of Johan Tzerclaes, Count of Tilly and Don Gonzalo Fernández de Córdoba.
This hapned through the cowardice of the Dutchmen in the outworkes, as he fullye dilated it to mee.
[4] He was a courtier at the Elizabethan and Jacobean courts, where he was invited to entertainment events called "masques".
In 1617–19, he wrote a series of letters to Dudley Carleton, 1st Viscount Dorchester with detailed reports on the dramatic performances, including a first-hand account of Shakespeare's Pericles performed in May 1617.