http://www.onwar.com/chrono/1941/apr41/f07apr41.htm
Axis advancing in the desert
Monday, April 7, 1941 www.onwar.com
In North Africa... On the coast Derna is overrun in the continuing Axis advance. Inland near Mechili an armored battle begins between the German 5th Panzer Regiment and the remnants of the British 2nd Armored Division.
In the Balkans... As well as the frontal pressure on the Metaxas Line its left flank is being threatened by a German armored division which is moving south into Greece after having reached Strumica in the advance in Yugoslavia. The Greek Commander in Chief, General Papagos, further weakens the Aliakmon Line by sending forward a Greek force from it to try to block this last German advance. Also, after a rapid advance troops from the German 40th Panzer Corps enter Skopje in Yugoslavia late in the day.
In the Caribbean... US naval and air bases open in Bermuda. The carrier Ranger and other ships are to be based there as the Central Atlantic Neutrality Patrol. These forces will be considerably increased by three battleships and two carriers later in April and during May and June.