High-speed uniaxial compression tests were conducted in the strain-rate range 10(-1)-10(1) s(-1), at -11 degrees C, on freshwater ice and "Baltic" sea ice of mean salinity 2.4 +/- 0.7 ppt. Two different testing machines were used to check for machine stiffness effects. The results showed that for both types of ice, the strength, sigma, increased with strain rate, (epsilon) over dot, consistent with a power law, sigma = A(epsilon) over dot(m), where A = 8.9 and m = 0.15 for fresh water ice, and A = 6.0 and m = 0.19 for the "Baltic" sea ice. At a strain-rate of 10(1) s(-1), the freshwater ice was a factor of only 1.3 times stronger than the sea ice. Results are compared to literature values at lower strain rates.