Helgoland lies only about 46 kilometres, or 29 miles, from Germany, but its high cliffs make it a difficult place to take by force. A German attack would need a rapid coup before the Royal Navy could intervene. A prolonged siege would instead unfold in Britain's maritime and logistical backyard, where relief forces could arrive without operating at the end of a global supply line. The defenders would need guns that could answer bombardment and protected spaces underground, then only hold long enough for the fleet to arrive. Geography therefore favours a prepared garrison even though the island sits close to the German coast.
Chapter · 32:06-34:15
High cliffs make speed essential for an attacker
Assess the island terrain that makes a quick coup more plausible than a long siege.