Bonhoeffer traveled for the Intelligence Service (Abwehr) to Switzerland, Norway, Sweden, and Italy (Rome).  He was commissioned to find out how the Americans and English would react in the event of a coup.  Would their plans for war change?  Once again he met with his English friend, Bishop Bell, on the mission to Stockholm, and Bell was attempting to do everything he could in London to support German resistance.

Bell did not find a sympathetic hearing, however, and was given no credence within his government.  A positive answer would have greatly encouraged the German generals in their decision to go ahead with the coup.  On his trip to Switzerland, Dietrich had hoped to be able visit Karl Barth.  But this suddenly appeared to be awkward.

(Renate Bethge, Dietrich Bonhoeffer: A Brief Life, 56)