Books in the Preacher Spindrift series series

In the first great allied tank battle of WWI, at Cambrai in the Pas de Calais, German forces repulse the British. On waking to find he's being treated by the enigmatic Dr Spindrift, an injured Texan reservist's religious beliefs, sanity and courage are at breaking point. GODS' Enemy, Book #1 in the series, is a 2016 Indies Book Award Finalist.