11. He constructed the field fortifications of Anklam and Stralsund. 12. In mid-1940, the preparations relied heavily upon field fortifications . 13. They were also used against field fortifications , for clearing minefields and for breaching barbed wire. 14. The vast majority of the Mannerheim Line was merely composed of trenches and other field fortifications . 15. Poles attempted to regroup at the heavily fortified line of German World War I field fortifications . 16. Instead field fortification rose to dominate defensive action. 17. Both places were surrounded by field fortifications and Gallabat was held by a colonial infantry battalion. 18. The gun was intended for destruction of light field fortifications and openly placed personnel by direct fire. 19. A semicircle of field fortifications was created. 20. Construction works continued throughout the war building bunkers, field fortifications , barbed wire fences and air defense sites.
