3. so did the Egyptians during the war of attrition
During the War of Attrition, 12 IDF soldiers were taken captive by Egypt, and 3 were taken captive by the Syrians. On Aug 16. 1970 a wounded pilot was returned from Egypt and on Mar 29, 1971 one soldier was returned from Egypt.
On June 9, 1972 an IDF force abducted 5 Syrian officers that were on patrol near the Israel - Lebanon border, and in exchange for them 3 pilots were returned from Syria.
On June 3, 1973 - Three IDF pilots were returned, Captain Gidon Magen, Captain Pinchas Nachmani, and Lieutenant Boaz Eitan, after three years in captivity in Syria in exchange for 46 Syrian prisoners.
http://www.mfa.gov.il/MFA/MFAArchive/2000_2009/2004/1/Background%20on%20Israeli%20POWs%20and%20MIAs