Original sentence: A major conflict, called Ecuadorian–Peruvian War of 1941 started on January 11, 1941 after the Ecuadorian army tried implementing military control on disputed territory, which were seen as incursions by the Peruvians, therefore; the Peruvian Army started a so called conterattack to gain the disputed territory and occupied the western Ecuadorian province of El Oro and parts of the Andean province of Loja and advanced into the Amazonian area occupied by Ecuador according to a status quo agreement signed in 1936.Finally, the  government of Ecuador signed the full hated Rio Protocol on January 29, 1942, and Peruvians subsequently withdrew.The Peruvians made effective use of helicopters, air strikes against a small existent Ecuadorian Air force, and commando teams specially trained for jungle operations
Edited sentence: A major conflict, called Ecuadorian–Peruvian War of 1941 started on January 11, 1941 after the Ecuadorian army tried implementing military control on disputed territory, which were seen as incursions by the Peruvians, therefore; the Peruvian Army started a counterattack to gain the disputed territory and occupied the western Ecuadorian province of El Oro and parts of the Andean province of Loja and advanced into the Amazonian area occupied by Ecuador according to a status quo agreement signed in 1936.Finally, the  government of Ecuador signed the Rio Protocol on January 29, 1942, and Peruvians subsequently withdrew.The Peruvians made effective use of helicopters, air strikes against the Ecuadorian positions, and commando teams specially trained for jungle operations