Stuck in Backyard...

It has been raining here in MN for several days...and I had my Jimmy 1993 4.3 4WD sitting in the back yard hooked up to my small fishing boat ... then I was mowing the yard with my youngest son and went to turn the Jimmy around...........

Then it spun...so shifted to 4WD 4hi and 4lo...
The wheels just spun...no movement at all...so I quickly stopped and got out and the tires are sunk down to the rims...all tires...
My back yard is clay and black peat...
But, I was sad that my truck had no pulling power at all...
spun and sunk...without even rocking or moving at all...

I will next try to jack it up with a high-lift jack...(widdow maker)
jacking in the center on the rear and then when high enough...push the truck off the jack placing the tires on new turf...then repeat in front...

Next wait for a very dry day...and when friends are over for pushing power...and attempt to drive out...