On April 6, 1944, Plechavičius was given an order to mobilize the entire country. He refused, saying that it is impossible until the formation of his existing detachment was finished; this increased the Germans displeasure with him. In late April, as the German plans to mobilize Lithuanians into the German armed forces became obvious, Plechavičius secretly started organizing Tėvynės Apsaugos Rinktinė, an underground armed forces, which would include Lithuanian Army officers, veterans of the Lithuanian Wars of Independence, and former members of Lithuanian Riflemen Union. All across Lithuania, a network was secretly organized by territorial LTDF officers. The plans were to assemble around 75–80 thousand men. Most of the organizational structure was laid, and it served as a basis for the armed anti-Soviet resistance.