Destroyers could obtain ammunition through the Royal Navy's support and depot ships. This allowed them to rearm and supply the expedition's fire support. The army could not get enough artillery supplies through to support the campaign. That difference in resupply helps explain why land operations depended on ships' guns.
Notable Point · 4:20-4:52
Naval depot ships sustained destroyer fire support
Destroyer fire support remained practical because the navy could replenish ammunition through its support and depot ships, while army artillery supply lagged behind.