Do you have a cite for the tanks?

I presume you are referring to the charge of 16 January, 1942, at Morong by the 26th Cavalry, Philippine Scouts under then-LT Edwin Ramsey, which is known as the US Army's last horse-mounted cavalry charge. (Events in Afghanistan may have changed this, though).

The platoon had encountered the advanced guard of a Japanese force starting to cross a river into the town of Morong. Ramsey decided that he could do a better job of delaying the Japanese advance by bloodying the advance guard in a spoiling attack than by holding position and defending against a strong attack.

It worked. At the cost of three troopers wounded, the Japanese were thrown back. While they reconsolidated and tried to figure out what happened, American reinforcements showed up. LT Ramsey received the silver star.

Ramsay survived the war, retiring as an LTC. Here's his statement on the charge in 2009. https://www.youtube.com/watch?v=ez8g7_jQYWY

Now, no mention that I can see anywhere indicates that this advanced guard had tank support, which is why I put my first question up. At most, mortars and light artillery. I wonder if you're not confusing the incident with the charge at Krojanty, the mythical anti-tank charge by Polish cavalry in 1939. This also didn't happen, as the Poles successfully charged a group of resting infantry, only to be counter-attacked by tanks (and not faring well on the receiving end of it).