Young chose a plot as the temple site. Builders soon discovered that the chosen site was swampy with numerous underground streams. Young was consulted on moving the site, but he remained firm in the idea that this was the site for the temple. To deal with the swampy site, workers created drains to eliminate as much water as possible. Then they brought lava rock to the site and crushed it into a gravel to create a dry foundation for the temple. This led to a new problem: how to crush the rock. Someone suggested using an old cannon that the city had acquired. The old cannon was made in France and used by Napoleon during his siege on Moscow. During Napoleon's hasty retreat, however, the cannon was left behind. It was later dragged to Siberia, then Alaska, and finally ended up at a fort in California. Members of the Mormon Battalion acquired the cannon, had it mounted on wheels, and brought it to Utah. Today, the old cannon is displayed on the St. George temple grounds. After creating a pulley system, the cannon was used as a pile driver to compact the lava rock and earth and create a firm foundation.