In 1845, Darby returned from an extended visit to Switzerland where he had achieved considerable success planting churches. He returned to Plymouth where Newton was in control, and he disagreed with some details in a book that Newton had published concerning the tribulation that was coming. He also objected to Newton's place as an elder in the Plymouth meeting. But several attempts to settle the quarrel in the presence of other brethren failed to produce any clear result. Two years later, Darby attacked Newton over a lecture that Newton had given on the 6th Psalm, and an exchange of tracts followed. Newton retracted some of his statements, but he eventually left Plymouth and established another chapel in London.