The floating steel-and-concrete jetties and pontoons, hauled across the English Channel, were the only way of unloading tanks and heavy artillery on a coastline (Gold Beach) without natural harbors.
Pontoons were used to transport and unload artillery and tanks.
mnli hypothesis: Pontoons were used to transport and unload artillery and tanks. premise: The floating steel-and-concrete jetties and pontoons, hauled across the English Channel, were the only way of unloading tanks and heavy artillery on a coastline (Gold Beach) without natural harbors.