Such deep pike columns could crush lesser infantry in close combat and were invulnerable to the effects of a cavalry charge, but they were vulnerable to firearms if they could be immobilized (as seen in the Battle of Marignano). The Swiss mercenaries did deploy bows, crossbows, handguns and artillery of their own, however these always remained very subsidiary to the pike and halberd square. Despite the proven armour-penetration capability of firearms, they were also very inaccurate, slow-loading, and susceptible to damp conditions, and did not fit well with the fast-paced attack tactics used by the Swiss mercenary pike forces.