Had De Wet, in the operations which have already been described, evaded Charles Knox and crossed the Orange River, his entrance into the Colony would have been synchronous with the congress at Worcester, and the situation would have become more acute. This peril was fortunately averted. The agitation in the Colony suggested to the Boer leaders, however, that here was an untouched recruiting ground, and that small mobile invading parties might gather strength and become formidable. It was obvious, also, that by enlarging the field of operations the difficulties of the British Commander-in-chief would be very much increased, and the pressure upon the Boer guerillas in the Republics relaxed. Therefore, in spite of De Wet's failure to penetrate the Colony, several smaller bands under less-known leaders were despatched over the Orange River. With the help of the information and the supplies furnished by the local farmers, these bands wandered for many months over the great expanse of the Colony, taking refuge, when hard pressed, among the mountain ranges. They moved swiftly about, obtaining remounts from their friends, and avoiding everything in the nature of an action, save when the odds were overwhelmingly in their favour. Numerous small posts or patrols cut off, many skirmishes, and one or two railway smashes were the fruits of this invasion, which lasted till the end of the war, and kept the Colony in an extreme state of unrest during that period. A short account must be given here of the movement and exploits of these hostile bands, avoiding, as far as possible, that catalogue of obscure 'fonteins' and 'kops' which mark their progress.