KDF killed 57 al Shabaab militants near Afmadow in Somalia on Thursday morning.
Forces under Amison troops ambushed the militants using artillery fire, supported by helicopter gunships.
Spokesman Colonel Joseph Owuoth said the ambush took place 31 kilometres northwest of Afmadow at 8.45am.
"In the onslaught, 57 al Shabaab militants were killed and unknown number injured," Owuoth said.
He also said five gun-mounted pickup trucks known as "technicals" were destroyed.
"KDF troops remain vigilant and will continue to relentlessly pursue the terrorists to ensure peace and security of our country Kenya as well as support Amisom operations in order to stabilise Somalia,” he said in a statement.
In January, al Shabaab fighters attacked a Kenyan military base in the southern Somali town of Kulbiyow, near the Kenyan border.
KDF said nine soldiers died, while al Shabaab said it killed at least 66.
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A year before, al Shabaab said it had killed more than 100 Kenyan soldiers in El Adde, a Somali camp near the border with Kenya.
Kenyan troops did not release casualty figures from that attack, but media reports supported al Shabab's death toll.
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