Little by little the enclosing circle began to grow narrower. The infantry--the Cornwalls assisted by the Engineers--again set to work to push the enemy still farther back into the river, but otherwise little advance was made. The position was now sufficiently terrible for the enemy. Cronje's trap was about a mile square, while commanding it in every direction were guns multifarious; bushes and banks and ravines were swept by cataracts of shrapnel, while volumes of greenish-yellow smoke from bursting lyddite curved and twisted around the river-bed, then carried their noxious vapour to the serene sapphire of the heavens. In the clear atmosphere the reiterations of Maxims filled up the pauses between the steady booming of artillery, while now and again the impotent despairing splutter of rifles from the enemy's laager mingled with the stertorous rampage. On the fourth day of Cronje's resistance what might have been an unfortunate incident occurred. The Gloucester and Essex regiments by an accident had bivouacked on the north side of the river too close to the enemy's laager. The result was that on the first gleam of daylight they were discovered by the Dutchmen, who treated them to a volley by way of reveillé. Luckily the firing was not at all up to the Boer mark and the regiments came off scot-free. During the day General Smith Dorrien's force on the north worked towards the doomed laager while General Knox's brigade held the containing lines on the south side of the river. In the east General French was keeping an eye on a swarm of Boers who were hoping to come to the rescue of Cronje. These held a strong position on a kopje which seemed to be specially constructed by nature for defensive purposes. Still, when General Broadwood's brigade and a battery of horse-artillery turned their attention to the summit and scoured it thoroughly, the Dutchmen helter-skelter fled. Unluckily for them, their precipitate action took them straight into the arms of General French, who having headed them towards the drift, now gave them so warm a reception that numbers bit the dust. Some escaped, but fifty were taken prisoners. Forage, provisions, and equipment were also seized, though the corpses of the slain were carried off, so that the tale of loss could not be told.