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In page Second Boer War:

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In retrospect, the Boers' decision to commit themselves to sieges (Sitzkrieg) was a mistake and one of the best illustrations of their lack of strategic vision[citation needed]. Historically, it had little in its favour. Of the seven sieges in the First Boer War, the Boers had prevailed in none. More importantly, it handed the initiative back to the British and allowed them time to recover, which they did. Generally speaking, throughout the campaign, the Boers were too defensive and passive, wasting the opportunities they had for victory. Yet that passivity also testified to the fact that they had no desire to conquer British territory, but only to preserve their ability to rule in their own territory.[2]: 82–85