He was educated at Wadham College, Oxford[2] and lived at the family seat in Northbourne, Kent.
[3][page needed] Sandys was also a key leader in fighting in the first battle of the First English Civil War.
As a result, Henry Sandys invoked a clause in his father's will that allowed him to delay the release of parts of the estate to his younger brothers.
[10] Sir John was transported to Fleet Prison and five wagon loads of food, valuable items and weapons were confiscated.
Sandys then moved to confiscate the arms of George Stewart, 9th Seigneur d'Aubigny at Cobham Hall and John Tufton, 2nd Earl of Thanet from Hothfield, both prominent royalists.
[15][16] In Bruno Ryves account of the destruction of the cathedral, in Mecurius Rusticus, published in 1643, he charged Sandys with overseeing wholesale destruction inside the cathedral listing stalls, velvet, tables, books and altar rails destroyed.
[17] Bruno Ryves was Chaplain to King Charles I and Thomas Paske credited Sandys with halting the destruction of the cathedral.
[18] On 23 September 1642, barely a month after the defilement at Canterbury and Rochester Cathedrals, Sandys was a leader at the disastrous rout for the Parliamentarians at the Battle of Powick Bridge.
[19][20] Sandys was mortally wounded having bravely[21] led an ill-fated charge against forces commanded by Prince Rupert of the Rhine, in the first skirmish of the Civil War, but did not die until December 1642.