with the outside world via the Portuguese
settlement on Delagoa Bay. They were not successful. The lowlands of the
eastern Transvaal and the Limpopo River valley were breeding grounds for
anopheles mosquitoes
and tsetse flies, which took a heavy toll of the emi-
grants and their cattle.V
Other emigrants,
including
Pretorius and his
followers, made their new homes in the western highveld, around
Pot-
chefstroom. Still others settled south of the Vaal River.
The emigrants considered the highveld grasslands they were occupying
to be theirs by right of conquest
from Mzilikazi's
Ndebele.
After the
93