Special to The New York Times.

HAVANA, April 25--Seven rebels were killed in an encounter with army troops on the Corral Nuevo Plantation near Holguin, Oriente Province, according to a communiqué issued today by Camp Columbia army headquarters.  Seven shotguns, five rifles, and nine vehicles were captured, it said.

Headquarters also reported that rebels had assaulted the San Jose Plantation near Holguin and killed the owner Mariano Roman, when he refused to join them.  His daughter was wounded.  I Las Villas Province, the rural guards at Esperanza reported that two rebels had surrendered.

The British Embassy in Havana has arranged a safe-conduct for two Britons, Lionel Daly, 21 years old, and his brother Lawrence, 19 out of the combat zone in the Sierra Maestra, where Government troops and insurgents of Fidel Castro, rebel leader, are fighting almost daily.

The young men's mother, Mrs. Leonard Daly, is now on her way to the area, where the family coffee plantation is situated.

The British Embassy also is intervening in the case of M. J. Norman, another Briton arrested last week on a charge that he is a member of the Castro 26th of July movement.