Hi. I planted nasturtium in my vegetable garden hoping they would ward off harmful insects. There are many ants in the area and this morning I noticed an unusually high amount of ant activity near the nasturtiums. When I inspected the underside of the nasturtium leaves I found a gazillion tiny black/brown eggs?

They are highly squishable but too many and too icky to do by hand. What are these and how can I get rid of them? Sorry I'm unable to show a photo. Any ideas? Thanks.