through whose countries the raider passed to and fro with perfect
impunity.

Mugambi, the ebon Hercules, who had shared the dangers and vicissitudes
of his beloved Bwana, from Jungle Island, almost to the headwaters
of the Ugambi, was the first to note the bold approach of the
sinister caravan.

He it was whom Tarzan had left in charge of the warriors who remained
to guard Lady Greystoke, nor could a braver or more loyal guardian
have been found in any clime or upon any soil. A giant in stature,
a savage, fearless warrior, the huge black possessed also soul and
judgment in proportion to his bulk and his ferocity.

Not once since his master had departed had he been beyond sight or
sound of the bungalow, except when Lady Greystoke chose to canter
across the broad plain, or relieve the monotony of her loneliness
by a brief hunting excursion. On such occasions Mugambi, mounted
upon a wiry Arab, had ridden close at her horse's heels.

The raiders were still a long way off when the warrior's keen eyes
discovered them. For a time he stood scrutinizing the advancing
party in silence, then he turned and ran rapidly in the direction
of the native huts which lay a few hundred yards below the bungalow.

Here he called out to the lolling warriors. He issued orders
rapidly. In compliance with them the men seized upon their weapons
and their shields. Some ran to call in the workers from the fields
and to warn the tenders of the flocks and herds. The majority
followed Mugambi back toward the bungalow.