Against SMALL Forts: 2 were stormed:
1 by 3 columns (successfully) = 50%
1 was stormed by 1 column (unsuccessfully) = 50%

Against BIG Forts:
With an ADEQUATE army: 5 cases:

2 attacked in 4 columns (40%)
2 attacked in 3 columns (40%)
1 attacked in 1 column (20%)
A total of 4 of these forts were captured (80%)

With a SMALL army: 9 cases:

1 of these cancelled its assault instantly (11%)
3 attacked in 2 columns (33%)
5 attacked in 1 column (56%)
A total of 2 of thse forts were captured (22%)

Storming Through the Peninsula

Siege Operations in the Napoleonic Wars
Table 1: Small Forts are Easy Prey and Big Forts Can Be Taken
Table 2: Number of Columns in Each Attack
Table 3: Success of Each Column Against a Big Fort
Peninsula Storming The Game