Hydrographic data collected with a towed, depth-cycling instrument (Batfish) in the frontal regions of warm-core ring 82H during and immediately after its formation were analyzed to study small-scale structure and processes. The frontal and slope water regions are characterized by a complex water-mass structure resulting from mixing of the shelf, the slope, and the Sargasso Sea Water. Thermohaline intrusions along constant density surfaces are frequently observed. Two forms of thermohaline intrusions are studied in detail: subsurface tonguelike intrusions and cold filaments. A subsurface tongue of shelf water origin was found in the slope water region outside the frontal zone at 70-m, depth. It has a width of 4 km, a thickness of 20 m, and a length of at least 40 km, and moved in a southwest direction toward the front. Alongside the subsurface tongue, a cold filament 10 km wide, extending from the surface to 120-m depth, was observed. As the sursurface tongue and the filament moved toward the frontal zone their orientation became more and more aligned with the front. When they reached the front, the strong frontal current carried them downstream and hence prevented further intrusion into the ring. Mixing in the form of interleaving then became the most important process for cross-front mixing. Interleaving occurs along the side walls of the subsurface tongue and filament, with more intense interleaving associated with stronger intrusions. This suggests a double-diffusive generation mechanism of the interleaving.