It was the first Martian my brother had seen, and he stood, more
amazed than terrified, watching this Titan advancing deliberately
towards the shipping, wading farther and farther into the water as the
coast fell away.  Then, far away beyond the Crouch, came another,
striding over some stunted trees, and then yet another, still farther
off, wading deeply through a shiny mudflat that seemed to hang halfway
up between sea and sky.  They were all stalking seaward, as if to
intercept the escape of the multitudinous vessels that were crowded
between Foulness and the Naze.  In spite of the throbbing exertions of
the engines of the little paddle-boat, and the pouring foam that her
wheels flung behind her, she receded with terrifying slowness from
this ominous advance.