| But when they attacked in March 1915, Allied naval forces had been turned back by enemy minefields, and had called in land forces to help. |
| Protection of areas and positions held by the troops is carried out via installation of controlled minefields only. |
| Other tasks included identifying and isolating minefields and unexploded ordnance that ringed the base. |
| In the months and years to follow, it would harden into a massive barrier of concrete blocks, barbed wire, machine gun towers, and minefields. |
| A key role in this warfare is assigned to remote minelaying and remotely controlled minefields. |
| Breaching minefields and other explosive obstacles that were widely used during the war posed a special difficulty. |
