To facilitate the defence, the important islands on the western edge of the atoll would eventually be linked by a light railway across causeways built up between the islands, but this was not operational until much later in the war.
The important islands on the western edge of the atoll would eventually be linked by a light railway across causeways. This was to facilitate the defence. These causeways are built up between the islands. This was not operational until much later in the war.