That is the place that Hashem chose to give the Torah. They were fighting in Refidim. The Torah can only be given when there is peace among the Jewish people. They traveled from Refidim, meaning they distanced themselves from the fighting, and they came to the Sinai Desert. This placed was ideal to establish peace among them.
Fighting comes from a desire for honor.
When they saw that Hashem chose Mt. Sinai, a very low mountain, as the place for the giving of the Torah, they realized that Hashem favors humble people. Therefore, they humbled themselves and established peace. Now we see how important peace is. Without peace, there can be no Torah. By humbling ourselves.