  The structure of Sally modules of $\fkm$-primary ideals $I$ in a
Cohen-Macaulay local ring $(A, \m)$ satisfying the equality
$\e_1(I)=\e_0(I)-\ell_A(A/I)+1$ is explored, where $\e_0(I)$ and $\e_1(I)$
denote the first two Hilbert coefficients of $I$.
