As war clouds darkened , the United Arab Republic closed the Gulf of Aqaba to Israeli shipping .
Then , Israel beefed up her forces and , in turn , each of the other Arab countries put her armed forces on alert .
As war clouds darkened , the United Arab Republic closed the Gulf of Aqaba to Israel shipping .
Then , Israel beefed up her forces and , in turn , each of the other Arab countries put her armed forces on alert .