The army in eastern Democratic Republic of Congo has seized back control of a major military base from M23 rebels in a fourth day of renewed fighting, an army spokesman said Monday. \"We have taken the military base at Rumangabo,\" about 40 kilometres (25 miles) north of Goma, the capital of embattled North Kivu province, Lieutenant-Colonel Olivier Hamuli told AFP. \"We fought, but not for very long - the enemy is demoralised by the strength of (our) firepower.\"