The first moorland fire – on Saddleworth Moor – started on Sunday amid Britains heatwave and has devastated surrounding land around Carrbrook.
Assistant chief fire officer Dave Keelan said: This is an exceptionally challenging time and I am proud of the hard work and brave commitment of our firefighters.
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Lancashire fire service area manager Tony Cook said very intensive firefighting is taking place on Winter Hill, including personnel doing shuttle runs in appliances to get water to the scene while others manually try to beat the fire out.
Fire break trenches are also being dug to try to protect local buildings.
About 100 soldiers from the 4th Battalion, Royal Regiment of Scotland, were sent from their Yorkshire barracks on Thursday to aid firefighters in Saddleworth for an initial 48-hour deployment.
Their presence has been extended until Monday afternoon following a request by Greater Manchester mayor Andy Burnham.