If Shveta did not protect it, in one single day Bhishma could have in anger consumed the Pandava army with his arrows.
एकाछा निर्दहेद् भीष्मः पाण्डवानामनीकिनीम्॥ शरैः परमसंक्रुद्धो यदि श्वेतो न पालयेत्।