How to kill a battleship...

On the subject of Planetary invasions vs large ships, allow me the
suggest that folks should read Roger McBride Allen's "Rogue Powers". In
it the big ship folks learn a hard lesson during a sneak attack.

The invaders had Jumped into the system far enough out to be
effectively indetectable (say beyond the orbit of Saturn in the Sol
system). Then they careful set up the weapon....

A *big* mass driver on an asteriod hull. It fired multi kilogram
projectiles at say 10 km/sec or better. They were aimed as a "time on
target" barrage. Sure, it takes *months* for them to arrive on target.
So what?

You *cannot* armor against a several kilo projectile with a relative
velocity in the tens of km/sec. And all a big ship gets you is the
chance to intercept more of these "rocks".

If we assume high TLs in traveller, I bet we could boost these things
to a high fraction of lightspeed. In which cause they are equivalent to
a nuke! And they are *inherently* stealthed. Scratch any ship whose
moves you can predict sufficiently far in advance.

True, this is *definitely* limited to a "Pearl Harbor" scenario, but
they can happen... say just as the big naval manuevers get underway?
:-)