  Let E be a local system on a smooth projective curve of genus g with
monodromy given by a representation of the symmetric group corresponding to a
Young diagram with rows of lengths n_1,n_2,... where n_1 > n_2 + (2g-2), n_2 >
n_3 + (2g-2), ..., n_{k-1} > n_k + (2g-2), n_k > n_{k+1} + n_{k+2} + ... +
(2g-2). We show that the result of k steps of the Drinfeld-Laumon construction
applied to E is the IC sheaf of the Harder-Narasimhan stratum with subquotients
of rank 1 and degrees n_1, n_2, ..., n_k, n_{k+1}+n_{k+2}+... with coefficients
in a local system with monodromy given by the Young diagram with rows n_{k+1},
n_{k+2}, ...
