term Darbyites is also used, especially when describing the Exclusive branch which has a more pronounced influence from Darby. Many within the movement refuse to accept any name other than "Christian". 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. Darby had instituted a second meeting at Plymouth, and he complained of the Bristol Bethesda assembly in 1848, in which George Müller was prominent; he was concerned because they had accepted a member from Ebrington Street, Newton's original chapel. Bethesda investigated the individual but defended their decision, and Darby was not satisfied. He issued a circular on 26 August 1848, cutting off Bethesda and all assemblies who received anyone who went there. This defined the essential characteristic of "exclusivism" which he pursued for the rest of his life. The Exclusive Brethren experienced many subsequent splits, scatterings, and recombinations. The Open Brethren also suffered one split (concerning the autonomy of assemblies) which occurred at different times in different parts of the world. Nevertheless, both the Exclusive and the Open Brethren continued to expand their congregations, with the opens expanding more rapidly than the exclusives. Darby visited Exclusive assemblies in America seven times between 1862 and 1877. Itinerant preachers from Scotland and Ireland established most of the early Open Brethren assemblies in America in the second half of the 19th century. Open Brethren The best-known and oldest distinction between Open assemblies is in the nature of relationships among their local churches. Open Brethren assemblies function as networks of like-minded independent local churches. Brethren generally feel an obligation to recognize and adhere to the disciplinary actions of other associated assemblies. Conversely, Open assemblies aware of that disciplining would not automatically feel a binding obligation to support it, treating each case on its own merit.