 Complete the following phrase:  On the military level, along 1937 he launched a series of offensives in June Huesca  Segovia, July, Brunete and August, Belchite, in order to halt the Nationalist offensive in the North, but all failed and by October the Nationalists had occupied all of the Northern territory. Beginning December, he launched an offensive in order to free Teruel, but by February the Republican Army had to retreat after suffering heavy losses and the rebel faction launched a counter-offensive in Aragon, cutting in half the Republican-held zone. On July 1938 Negrín launched an offensive in order to cross the Ebro River and reconnect the two Republican-held zones. The Republican army managed to cross the Ebro, but by November had to retire after it suffered heavy casualties and lost most of its materiel. Finally, on February 1939, he ordered to launch an offensive in 