Nasser made secret contacts with Israel in 1954–55, but determined that peace with Israel would be impossible, considering it an "expansionist state that viewed the Arabs with disdain". On 28 February 1955, Israeli troops attacked the Egyptian-held Gaza Strip with the stated aim of suppressing Palestinian fedayeen raids. Nasser did not feel that the Egyptian Army was ready for a confrontation and did not retaliate militarily. His failure to respond to Israeli military action demonstrated the ineffectiveness of his armed forces and constituted a blow to his growing popularity. Nasser subsequently ordered the tightening of the blockade on Israeli shipping through the Straits of Tiran and restricted the use of airspace over the Gulf of Aqaba by Israeli aircraft in early September. The Israelis re-militarized the al-Auja Demilitarized Zone on the Egyptian border on 21 September.